MS-3381
A 33-year-old man arrives at the emergency department with complaints of decreased mobility. He reports experiencing difficulty walking due to weakness in his left foot. The patient has no significant medical history and is typically healthy, regularly participating in sports.
Upon examination, there is a decrease in sensation in the lateral aspect of the left foot and the posterior aspect of the left leg. The patient exhibits normal power on dorsiflexion but reduced power on plantarflexion of the left foot. Additionally, ankle reflexes are absent.
Which anatomical structure is likely to be damaged and causing the patient’s symptoms?